Using if statement with foreach

[Mark Vejvoda]

I would like to use the <jt:if> tag to check if a collection if empty, and if so output a blank cell (so that cell formatting is kept) otherwise output the value from the collection. Something like this pseudo code:

<jt:forEach items="${dates}" var="date" copyRight="true">
  <jt:if test="${myItems.getDataFor(date).size()==0}" then=" " else="<jt:forEach items=\"${myItems.getDataFor(date)}\" var=\"mydata\">${mydata.text}</jt:forEach>\" />
</jt:forEach>

I don't know how to use the if tag and then in a condition to loop through a collection? Is this possible or is there some other way?

[Randy Gettman]

I would use the form of the jt:if tag that takes a body. The body of an if tag, if present, is like the then attribute of a bodiless if tag. The elseAction attribute is valid for if tags with a body, and "clear" seems to do what you want, i.e. clear the cell without shifting, leaving formatting in place.

Try the following:

<jt:if test="${myItems.getDataFor(date).size() != 0}" elseAction="clear">
  <jt:forEach items="${myItems.getDataFor(date)}" var="mydata">${mydata.text}</jt:forEach>
</jt:if>

That should all be in one cell. It's a lot for one cell, but that should work.

[Mark Vejvoda]

Yes works great, thanks. The clear keeps cell formatting which is perfect.

[thrishala]

<jt:if test="${header.accountExecutives.size() != 0}" elseaction="clear">
<jt:foreach items="${header.accountExecutives}" var="ae">${ae.name}</jt:foreach>
</jt:if>
When I try as above approach , it gives me java.lang.NullPointerException: null
at org.apache.commons.jexl2.Interpreter.sizeOf(Interpreter.java:1474) ~[commons-jexl-2.1.1.jar:2.1.1]
at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1398) ~[commons-jexl-2.1.1.jar:2.1.1]
at org.apache.commons.jexl2.parser.ASTSizeMethod.jjtAccept(ASTSizeMethod.java:18) ~[commons-jexl-2.1.1.jar:2.1.1]
at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1317) ~[commons-jexl-2.1.1.jar:2.1.1]
at org.apache.commons.jexl2.parser.ASTReference.jjtAccept(ASTReference.java:18) ~[commons-jexl-2.1.1.jar:2.1.1]
at org.apache.commons.jexl2.Interpreter.visit(Interpreter.java:1195) ~[commons-jexl-2.1.1.jar:2.1.1]
What is the wrong with this?

[Etienne Canaud]

Maybe the expression on which you call .size() evaluates to null.

Can you share the expressions you're using in your jexl tags?

[thrishala]

Thanks for replying. Yes you are correct .Finally myself identified the issue which is with the the data set ,I have used .